Severanti seems to work fine, relatively simple mission of course but it clearly works. Failed once due to all of the evac ships dying, and then finished it fine on the second try.
Lopez seems to mostly work fine. The worst issue I had is I had a Sathanas randomly jump in and murder me after using the checkpoint while the convoy was on its way to the node. The beam overloads also occasionally prevent your beams from firing at all (before eventually returning to normal firing mode) rather than making your beams go totally bananas and wreck some ****. I think that last one was always a problem with that mission though.
I think I almost made it to the end (got the 'alright lets settle in for the long haul' dialog which I seem to vaguely recall is the ending?) on Lopez before colliding with a chunk of debris at 2% health and then dying (was only at 2% due to making the mistake of trying to use the beam overloads), so I think its finishable and mostly works.
By the way the checkpoints in Lopez seem to mainly work fine, I died quite a lot and therefore used them quite a lot, but only had the sathanas issue once. I seem to recall the sathanas thing being a punishment for using cheat codes, however I did not in fact do that so that was seemingly a bug of some sort.
Died a few too many times to bother finishing Lopez for now, but (apart from sathanas) they seemed to be legitimate deaths so I don't really attribute that to anything other than me not being particularly good at that mission.